In water, these molecules spontaneously align â with their heads facing outward and their tails lining up in the bilayer's interior. Thus, the hydrophilic heads of the glycerophospholipids in a cell's plasma membrane face both the water-based cytoplasm and the exterior of the cell.
An MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnets and radio waves to create pictures of the body. It does not use radiation (x-rays). Single MRI images are called slices. The images can be stored on a computer or printed on film.
Post. Tweet. A spinal MRI is an imaging test that uses powerful magnets, radio waves, and a computer to create detailed pictures of the discs and nerves of the spine. It may be used to detect problems such as infection, nerve damage, or a tumor, or to clarify results from other tests, such as an X-ray or CT scan.